ZnO:Mn稀磁薄膜光学性质和铁磁行为分析

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　　摘　要：采用脉冲激光沉积技术在蓝宝石（α-Al2O3）衬底上制备了不同Mn掺杂浓度的ZnO薄膜.实验结果表明,合适浓度的Mn的掺人,有利于ZnO:Mn薄膜（002）生长而不形成Mn的氧化物,同时,所有的薄膜均呈现出了室温铁磁特性.随着Mn含量的增加,薄膜光学带隙红移,对应的Mn离子电荷转移跃迁吸收逐渐增强,磁化强度逐渐减小.实验结果支持薄膜的铁磁性起源于替位的Mn离子之间的长程铁磁相互作用,Mn离子增加导致平均磁矩减小,可归因于邻近的Mn离子密度的增加引起的反铁磁作用增强,相对应的sp-d交换作用逐渐增加.

% r6 E% a( _0 [* b" r 　　关键词：Mn掺杂ZnO;sp-d交换;铁磁特性
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　　文章编号：1672-7126（2008）增刊-022-04

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